I believe something like this is what you want. You might be able to do it
without a sub-query by comparing the current name value to the lag value
and null it out if it's the same.
select
case when row_number = 1 then id end AS id,
case when row_number = 1 then name end as name,
phone.number
from(
select person.id, person.name, phone.number, row_number() partition
by( phone.person_id order by phone.number ) as row_number
from person
join phone on person.id = phone.person_id
) AS sub
order by name, row_number;